Usage Tips:Features 1、ORP Electrode: It is harmless to the human body and has good conductivity, and widely used in the test of aqueous solutions. 2、Wide Use: For most ORP meters and controllers with BNC Q9 connectors, used in water source systems such as aquariums, hydroponics, swimming pools. 3、PH Test: Measure the pH value in the aqueous solution for accurate up and down adjustment, which needs to be used in conjunction with the meter. 4、Strong Conductivity: The ORP replacement probe is made of sturdy and durable materials, has good conductivity, and is environmentally friendly. 5、ORP Probe: Different water quality ORP ion oxidation degree is always can help remove harmful substances in the water you use to. Specifications Item Type: ORP Replacement Probe Material: Plastic Electrode Length: Approx. 155mm / 6.1in (Delivered with liquid) Probe Type: Sensitive Crystal Ball Bubble Range: 0~±1999mV Accuracy: ±5mV Applicable Temperature Range: 5~70℃ Electrode Potential: 245-270mv (15~30℃) Internal Resistance of Reference Electrode: ≤10kΩ Electrode Stability: ±8mv/24 Electrode Indicator Electrode: Good Conductivity PH Electrode Wire Length: Approx. 1.2m / 3.93ft Gross Weight: Approx. 89g / 3.14oz Can be widely used in water source systems such as aquariums, hydroponics, hot springs, swimming pools, etc. Package List 1 x Electrode